Math

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Author:
martintm002
ID:
230092
Filename:
Math
Updated:
2013-08-15 11:57:43
Tags:
Math Terminology
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Description:
GRE Study guide for Math section
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  1. What are Integers?
    The integers are the numbers 1, 2, 3, and so on, together with their negatives -1, -2, -3, and 0. Thus, the set of integers is {...-3, -2, -1, 0, 1, 2, 3,...}
  2. When integers are multiplied, each of the multiplied integers is called:
    A factor or divisor of the resulting product
  3. Least common multiple
    The least common multiple of two nonzero integers a and b is the least positive integer that is a multiple of both a and b. For example, the least common multiple of 30 and 75 is 150. This is because the positive multiples of 30 are 30, 60, 90, 120, 150, 180, 210, 240, 270, 300, etc., and the positive multiples of 75 are 75, 150, 225, 300, 375, 450, etc. Thus, the common positive multiples of 30 and 75 are 150, 300, 450, etc., and the least of these is 150.
  4. Greatest common divisor (or greatest common factor)
    The greatest common divisor (or greatest common factor) of two nonzero integers a and b is the greatest positive integer that is a divisor of both a and b. For example, the greatest common divisor of 30 and 75 is 15. This is because the positive divisors of 30 are 1, 2, 3, 5, 6, 10, 15, and 30, and the positive divisors of 75 are 1, 3, 5, 15, 25, and 75. Thus, the common positive divisors of 30 and 75 are 1, 3, 5, and 15, and the greatest of these is 15.
  5. What is a Prime Number?
    A prime number is an integer greater than 1 that has only two positive divisors: 1 and itself. The first ten prime numbers are 2, 3, 5, 7, 11, 13, 17, 19, 23, and 29. The integer 14 is not a prime number, since it has four positive divisors: 1, 2, 7, and 14. The integer 1 is not a prime number, and the integer 2 is the only prime number that is even.
  6. The Numerator on a fraction is located where?
    On the Top
  7. The Denominator of a fraction is located where?
    The bottom

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